Diagnostic files copying

[DOsinga]

Summary

Hitting c now copies the current file - prettifies json for response/requests

[Copilot]

Pull request overview

This PR adds a copy-to-clipboard feature for the diagnostics viewer, allowing users to press 'c' to copy the currently displayed file with automatic JSON pretty-formatting for request/response data.

Changes:

• Added tracking of current filename and part (request/responses) in FileViewer
• Added 'c' keyboard binding to copy current file content with JSON formatting

[Copilot]

This list comprehension will fail if any response line has invalid JSON, causing the entire operation to fall back to copying raw text. This is inconsistent with _show_jsonl (lines 344-349) which parses responses individually and skips malformed lines. Consider using a similar approach: iterate through lines[1:] with individual try-except blocks to collect only valid responses, matching the viewing behavior.

Suggested change

	try:
	responses = [json.loads(line) for line in lines[1:]]
	if len(responses) == 1:
	content = json.dumps(responses[0], indent=2)
	else:
	content = json.dumps(responses, indent=2)
	except json.JSONDecodeError:
	responses = []
	for line in lines[1:]:
	try:
	responses.append(json.loads(line))
	except json.JSONDecodeError:
	# Skip malformed JSON lines to match _show_jsonl behavior
	continue
	if responses:
	if len(responses) == 1:
	content = json.dumps(responses[0], indent=2)
	else:
	content = json.dumps(responses, indent=2)
	else:

[Copilot]

'except' clause does nothing but pass and there is no explanatory comment.

Suggested change

	except json.JSONDecodeError:
	except json.JSONDecodeError:
	# If content is not valid JSON, fall back to copying it as-is.